Speedometer



Feb. 22 1927.

A. SEGUIN SPEEDOMETEB Filed May 1e,' 1924 2 Sheets-Sheet 1 \as w I Augustin S eguin By lg His Attbrhey A. SEGUIN smnnomsmzm Febe' 22, 1927;

Filed May 16, 1924 2 Sheets-Sheet 2 Patented Feb. 22, 1927.

UNITED STATES AUGUSTIN SEGUIN', OF PARIS, FRANCE.

' srEEDoME'r n.

Application filed May 16, 1924, Serial No. 713,808, and in France June 4,. 1923.

The present invention relates to speedindicating apparatus of the type described in my prior Patent No. 1,499,881, filed May 31, 1921.

In the said apparatus, thestrikcr constituting the element of comparison is mounted loose on the shaft'of the balance wheel which serves to actuate the said striker during its expansion movement, the'striker being actuated through the medium of stud secured to the said balance wheel and with which the said striker comes into contact.

According to the present invention, an elastic connection is provided between the striker and the balance wheel, whereby the motion of the latter with respect to the striker when the balance wheelduring each revolution-4s released from the driving wheel at the end of each forward stroke, is impeded, the said elastic connection thus providing for the damping of the forward stroke of the balance wheel, whilst the striker is arrested by a stop-piece;

The appended drawings show by way of example an embodiment of the said invention. 9 Fig. 1 is a plan view of the apparatus the striker being represented in an instantaneous position during the expansion movement of the balance wheel. Fig. 2 is a similar view showing the instantaneous position of the striker somewhat before it is released'from the stud 13; and Fig.3 is a cross'section on line 3-3 of Fig. 2. V

As stated in my above-mentioned specification, the speedometer according to the present invention comprises a frame consisting of the plate a, the two cross-pieces b, and the plate c, and containing the various parts of the apparatus. Upon the plate a is mounted the screw 01, Fig. 3, upon which is disposed the gear v wheel 4 which is actuated at a speed proportional to the speed to be'measured, by means of the pinion e. A shaft 9 is journalled at one end in the wheel 4 and at the other end in the plate 0; upon the said shaft is mounted a balance wheel 6 provided with a spiral spring 7 The spiral spring 7 is secured atone end to the plate a by means of a screw 98 while the other end is folded laterally and engages a saw cut. 100 in the sleeve 9 Upon the outer face of the plate 0 is mounted the indicating pointer 9 whereofthe part situated at the centre of the apparatus com prises an extension 10 to which is secured an arm 8 at right angles to theplane of the pointer.

. The said balance wheel is mounted by friction upon its shaft. A thin convex washer 9, Figs. 2 and 3, secured to a shoulder on the sleeve 9 and acting by friction upon the balance wheel, prevents the latter from turning during the normal operation. Upon the shaft 9 of the balance wheel is mounted a disc 5*, Figs. 2 and 3, which is secured to sleeve 9 by means of set screws 99; upon the latter is also frictionally mounted a striker 5, Figs. 2 and 3, adapted to be driven by the stud 19 of the disc 5 during the expansion movement of the balance wheel; the stud 19 engaging a side of the striker 5 serves to drive the said striker in the contrary direction to the arrow P, Fig. 1.

To the wheel l is pivoted at 12 a small arm 11 whose outer end (with reference to its pivoting axle 12) has the shape of a hook c (Fig. 2); said arm is controlled by 'the spring a which is secured at a to the wheel 4; the said hook co-operates with the direction of. the arrow, Fig. 1. The lower face of the arm 11 carries the stud 2, Figs.

1 and 2, co-operating with a circular cam A provided with a boss 20. The arm 11 is further provided'upon its upper face with a stud 13 co-operating with the striker 5 which comes into contact with the stud 19 of the disc 5 secured to the balance'wheel, so that the latter will be driven in the direction of 90 the arrow 7. But according to this invention, the striker 5 and the disc 5 areconnected together for instance by a spring 101, Fig. 2, whereof one end is attached to the end of the striker and the other to the rim of the disc 5. I

In the same manner as for the-apparatus described in my above said. patent application, when thepiniou c rotatesin the direction of the arrow 7, the drivingwheel 0 instantaneous fposimion shown in Fig. 2. 1m

arm 8 in order to impel the pointer 9 in the stud 19 secured to the thereby releasing the balance wheel. The ance wheel is subjected to a stronger torque striker is arrested at this time h the stop piece screwed into the plate 6 in order to prevent it from heine drawn too far and thus taken up by the stud 13 which would now have returned to its inoperative position, before the balance wheel returns baclnrard. rkiter a greater or forward motion. according to the speed to he measured the balance wheel then turns backward-contrary to the arrow f and again comes into contact with the striker 5, (ll'l\'- ing the latter through the medium ot the stud l9 (instantaneous position shown in Fig. '1.)

The arm 8 ol the pointer may be actuated either by the hook r of the lever lji accord ing to the arrow f, or by the striker in the direction of the arrow 7". lint when the striker, which is now rotating backward by reason of the expansion niovementot the balant'e wheel, comes into contact with the stud 13, the latter will mount upon the amp la of the striker, and the hook r will be disengaged "from the arm 8 which thus re mains statimiarv whilst the arm 13 again drives thestriker and balance wheel torward. l t in fact this position of the arm 8 and thcre'tore of the pointer {l which indicates the speed sought for.

i It. the speed to be measured increases the disengagement of arm 8 tron] book a. due to the contact of stud 1 3 with the ramp I), will take place somewhat farther in the direction of arrow f since arm 1L together with hook in will have turned through a greater angle than before. Arm 8 and. therefore, pointer S) will thus be turned through a certain angle and the new posi tion of pointer 9 will correspond to that greater spec/r It the speed to be measured decreases, the striker 5 will meet the stud 1?} at a point situated somewhat nearer the boss 20 and, eonsequently will meet. the arm 8 before meeting the stud 113. Striker 5 will thus drive the arm 8, together with the pointer S) in the backward direction (arrtnr f) until the eiu ageinent takes place with stud 13. At this instant, the striker ii is driven in the torwari'l direction by the stud 1?, but at the same time. the hook I shifted radially by the engagement oi stud l3 and ramp d... thus iGlOREdDtI the arm it? exactly at the point where striker 5 met with stud iii.

The new position ot iiointer ll, somewhat to the rear from the lll'tllttllltg' a smaller speed.

Iln the apparatus according to the invention, the elastic connection between the striker 5 and the disoti provides for the regularity of the period oi? forward motion of the balance wheel after the said striker has been arrested by the stop-piece 27; due to the action of the spring 101, the balci'irl'espoiuls to during said perioth so that any errors which may occur, for inatance irregularities in the spiral spring of the balance wheel or varia tions in the friction ot the balance upon the washer q, will have a reduced etleet upon this motion.

Further the elastie connection between the striker 5 and the disc 5 prevents any hack motion ot the striker before the stud ll--whicl1 has been drawn along with the balance wheel and the disc 5 in their forward motion-4121s moved backward into con tact with the striker; il'or in tact; it the spring 101 were not en' plo xed, since the striker in contact with tlhclmlance wbceh it would begin to he driven liiackward along; with the balance wheel as soon as the latter rotates backward. and before the stud 19 reaches hack the striker. An angular displacement which might; prove a source oi error, would thus he produced betwcenthe balance wheel and the striker. On the eontrary, the spring; 101. will, in all cases urge the striker against the said stud.

It is eridcnt on the one hand that in the ease of apparatus in which the balance wheel (3 is keyed to its shaft instead ol being mounted thereon by friction, the elastic con. nection will be made directly between the striker and the balance wheel, andon the other hand that any other suitable connectiug means than those described may be employed without departing from the prineiple of the invention. l

Having now described my invention, what I claim as new and desire to secure by Letters Patent is: i i

1. In a speed measuring, apparatus of the kind referred to the combination of a balance wheel, a striker adapted in alternately drive said balance wheel in a forward direction and be driven by the same in a rearward direction and elastic means for connecting said striker to saidbalanee wheel and whereby the movements of thebalanee wheel relative to the striker are iinpededf An apparatus for the measurement of speed comprising in eoml'iination: a driving member OlJt-iitllllt? at a speed proportional to the speed to be measured, an antagoi iistie morable incn'iher frietionally mounted onits axle, a riker loosely mrniuted on said axle, means wlu-rehy said striker may drii e said for rotating said antagonistic member and said striker in the opposite direction to that oi the speed to be measured, indicating means adapted to be operated by said driving member and by said striker respectively,

wheel antagonistic member and reciprocally, means tagonistic member and whereby the movements'ot' the latter relative to the striker are impeded.

3. An apparatus for the measurement of speed comprising in combination: a drivin 0' member operable at a speed proportional to the speed to be measured, an antagonistic movable member frictionally mounted on its axle, a striker loosely mounted on said axle,

means whereby said striker may drive said antagonistic member and reciprocally, means for rotating said antagonistic member and said striker in the opposite direction to that of the speed to be measured, indicating means adapted to be operated by said driving member and by said striker respectively, means for rotating said striker and said antagonistic member in the direction of the speed to be measured, means for disengaging said striker from the driving member, means adapted to couple said driving member with the indicating means, means including said striker for disengaging the indicating means from the driving member and a spring the end parts whereof are respectively connected to said striker and to said antagonistic member, whereby the movements of the latter relatively to the striker are impeded.

4. An apparatus for the measurement of speed comprising in combination: a driving member operable at a speed proportional to the speed to be measured an antagonistic movable member frictionally mounted on its axle, a striker loosely mounted on said axle, means whereby said striker may drive said antagonistic member and reciprocally, means tor-rotating said antagonistic member and said striker in the opposite direction to that of the speed to be measured, indicating means adapted to be operated by said driving member and by said striker respectively, means for rotating said striker and said antagonistic member in the direction of the speed to be measured, means for disengaging said striker from the driving member, means adapted to couple said driving member with the indicating means, means including said striker for disengaging the indicating means from the driving member and a coil spring having one end attached to said striker and the other end connected to said antagonistic member, whereby the movements of the latter relatively to the striker are impeded.

In testimony whereof I have signed my name to this specification.

AUGUSTIN SEGUIN. 

